South Korean investigators have traced back Wednesday's cyber attack that crippled the country's banking system to Chinese servers. Although Chinese IP addresses were used in the attack, North Korea remains the prime suspect.

Computer networks at several South Korean banks and TV broadcasters crashed simultaneously early Wednesday. The attack paralysed ATMs across the country starting at 0520 GMT and they were still down six hours later.

As the tech press gears up to shower Samsung’s new Galaxy S4 with praise, North Korea is threatening to shower the South with a deadly blanket of ancient Soviet artillery and maybe even a pinch of uranium fuelled instant sunshine.